chemical engineering MCQs – Page 406

Practise multiple-choice questions from chemical engineering for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemical engineering Mcqs
8101. ____________ explains the equilibrium constant for any chemical reaction?
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A. Henrys law

B. Law of mass action

C. None of these

D. Hesss law

8102. The number of degree of freedom for an Azeotropic mixture of ethanol and water in vapourliquid equilibrium, is__________________?
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A. 1

B. 0

C. 3

D. 2

8103. A cylinder contains 640 gm of liquid oxygen. The volume occupied (in litres) by the oxygen, when it is released and brought to standard conditions (0C, 760 mm Hg) will be _____________ litres?
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A. Data insufficient; cant be computed

B. 22.4

C. 224

D. 448
8104. Which is a state function ?
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A. Work

B. Specific volume

C. Pressure

D. Temperature

8105. Chemical potential of ith component of a system is given by________________?
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A. ?i = (?F/?ni)T, P, ni

B. ?i = (?F/?ni)T, P

C. ?i = (?A/?ni)T, P, ni

D. ?i = (?A/?ni)T, P

8106. Joule-Thomson effect i.e., a throttling process is a constant _____________ process?
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A. Entropy

B. Enthalpy

C. Temperature

D. Internal energy

8107. If two gases have same reduced temperature and reduced pressure, then they will have the same____________________?
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A. Critical temperature

B. Mass

C. Volume

D. None of these
8108. Equilibrium constant of a reaction varies with the____________________?
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A. Pressure

B. Initial concentration of the reactant

C. None of these

D. Temperature
8109. A reasonably general expression for vapour-liquid phase equilibrium at low to moderate pressure is ?i yi P = Yi xifi where, ? is a vapor fugacity component, Yi is the liquid activity coefficient and fi is the fugacity of the pure component i. the Ki value (Yi = Ki xi) is therefore, in general a function of ______________________?
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A. Temperature and pressure only

B. Temperature, pressure and liquid composition xi only

C. Temperature only

D. Temperature, pressure, liquid composition xi and vapour composition yi

8110. Which of the following has the least thermal efficiency ?
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A. Otto engine

B. Steam engine

C. Carnot engine

D. Diesel engine

8111. A refrigeration cycle is the same as a _____________ cycle?
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A. None of these

B. Turbine

C. Heat engine

D. Reversed heat engine
8112. In the reaction, C + O2 ? CO2; ?H = 94 kcal. What is the heat content (enthalpy) of O2 ?
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A. -94 kcal

B. Zero

C. < 94 kcal

D. > -94 kcal

8113. What is the degree of freedom for a system comprising liquid water equilibrium with its vapour ?
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A. 1

B. 3

C. 2

D. 0

8114. Vapour which is at a pressure smaller than the saturation pressure for the temperature involved is called a _____________ vapour?
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A. None of these

B. Superheated

C. Desuperheated

D. Non-condensable

8115. The heat capacities for the ideal gas state depend upon the_________________?
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A. Pressure

B. Temperature

C. Both A. & B.

D. Neither A. nor B.

8116. When a system in equilibrium is subjected to a change in temperature, pressure or concentration, the equilibrium is displaced in a direction which tends to undo the effect of the change. This is called the_______________?
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A. Law of corresponding state

B. Le-Chatelier principle

C. Arrhenius hypothesis

D. Kopps rule

8117. In a working refrigerator, the value of COP is always__________________?
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A. < 0

B. < 1

C. > 1

D. 0

8118. Which of the following is affected by the temperature ?
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A. All A, B. & C

B. Activity co-efficient

C. Fugacity

D. Free energy

8119. The work done in isothermal compression compared to that in adiabatic compression will be__________________?
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A. Less

B. Same

C. More or less depending upon the extent of work done

D. More
8120. At equilibrium condition, the chemical potential of a material in different phases in contact with each other is equal. The chemical potential for a real gas (?) is given by (where, ? = standard chemical potential at unit fugacity (f = 1 atm.) and the gas behaves ideally.) ?
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A. ? + RT ln f

B. ?+ R ln f

C. ? + R/T ln f

D. ? + T ln f